Labour share decline institutional decomposition

The labour share of national income has declined across most advanced economies since roughly 1980, documented by Karabarbounis and Neiman (2014) and extended in subsequent work. The decline is not uniform across countries, sectors, or measurement approaches, and competing mechanisms — falling relative price of capital, globalisation and offshoring, rising market concentration, intangible capital intensity, and measurement artefacts from housing imputed rent — all contribute in different proportions. The framework's position is that the decomposition matters: different channels imply different institutional responses, and collapsing them into a single "capital vs labour" story obscures the policy-relevant variation.

confidence: medium highDistributional considerationsentry added 2026-07-18labour_share_decline_institutional_decomposition

Institutional features that make the model work

›Capital price channel

Karabarbounis-Neiman's original identification: the relative price of investment goods fell, firms substituted capital for labour where the elasticity of substitution exceeded one. Implication: the labour-share decline is partly a relative- price artefact of cheaper capital, not pure rent extraction.

›Globalisation and offshoring

Tradable-sector labour in advanced economies faced effective labour-supply expansion from China's integration and post-1990s offshoring. Autor-Dorn-Hanson China-shock literature identifies the channel quantitatively.

›Market concentration and markups

De Loecker, Eeckhout, and Unger 2020 document rising markups and concentration in US data. Accounts for a portion of the labour-share decline, particularly in the superstar-firm tail. Contested in measurement and in external validity.

›Intangible capital mismeasurement

Intangible capital (software, patents, organisational capital) may be under-measured, inflating the apparent capital share. Koh-Santaeulalia-Llopis-Zheng 2020 argues that properly accounting for IP capital removes most of the US labour-share decline post-1980.

›Housing imputed rent

Rognlie 2015 showed that much of the apparent capital-share rise concentrates in housing imputed rent in supply- restricted cities. Implication: the institutional lever is housing supply, not generic capital taxation.

›Collective bargaining erosion

US and UK union-density declines correlate in time with labour-share declines in the same countries. Nordic and German sectoral bargaining persistence correlates with more stable labour shares.

Supporting cases

karabarbounis_neiman_2014_cross_country

Cross-country panel documenting labour-share decline in most advanced economies post-1975, linked to falling relative price of investment goods.

rognlie_2015_housing_decomposition

Reanalysis of Piketty's capital-share rise showing housing imputed rent accounts for the large majority. Redirects the diagnosis toward supply-restricted urban housing markets.

autor_dorn_hanson_china_shock

Commuting-zone level evidence of labour-market disruption from Chinese import competition in US manufacturing communities. Channel-specific, local, identifiable.

german_sectoral_bargaining_share_stability

Germany's sectoral bargaining persistence corresponds with relatively more stable labour share than Anglo-Saxon peers, though German share also declined during the 2000s Hartz reform period.

Disconfirming cases

koh_santaeulalia_zheng_intangible_adjustment

Adjusting for intangible capital (IP, software) removes most of the US labour-share decline post-1980. Not all researchers accept the adjustment methodology, but it disciplines claims that the decline is purely distributional.

labour_share_stability_in_some_oecd

Several OECD economies show stable or slightly rising labour shares over the same period. Cross-country heterogeneity undermines monocausal explanations.

What this condition is NOT

A vindication of any single mechanism — all channels contribute in varying proportions
A claim that the labour-share decline is entirely a measurement artefact
A claim that the labour-share decline is entirely distributional capture
An endorsement of generic capital taxation as the response
A claim that the Piketty r>g framework is either fully correct or fully wrong — it is a partial contribution

Policy implications

Institutional response depends on which channel dominates in the specific country. Rising markups and concentration imply antitrust reinvigoration. Housing-driven capital-share rise implies planning and zoning reform. Globalisation-driven manufacturing-worker displacement implies adjustment support and place-based policy rather than retreat from trade. Collective-bargaining erosion implies labour-law reform where institutional capacity exists. The policy error is applying a one-size-fits-all response (generic capital taxation, generic minimum-wage increase) when the dominant channel differs across countries.

Framework position

The framework treats the labour-share decline as a real but heterogeneous pattern requiring channel-specific decomposition. The honest summary of the empirical literature is that (a) the falling relative price of capital and (b) globalisation and (c) housing imputed rent explain a large fraction of the gross decline; (d) rising markups and concentration and (e) collective-bargaining erosion account for identifiable additional portions in specific countries; and (f) intangible-capital measurement adjustments remove more of the decline than is often acknowledged. Policy response follows the channel: antitrust for concentration, housing supply for imputed rent, adjustment policy for trade shocks. Collapsing all channels into a "capital vs labour" narrative produces worse policy than decomposed diagnosis.